Substitute something for something

Example: The recipe says you can substitute yogurt for the sour cream.
In this sentence, it means you can use yogurt to replace sour cream? or the opposite?

Thank you!!!

substitute for= use or add in place of smth.
That’s why in your case - you can use yogurt instead of the sour cream.
Another example: A construction which may sustitute for a word is a phrase.

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You can use either in the recipe. Is is saying instead of using sour cream you can use yogurt. You would be replacing the sour cream with yogurt

A teacher is out sick a substitute replaces the sick teacher for the day. Substitute is a replacement